SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'eitems_privat.last_seen_just_now', 
    'eitems_privat.last_seen_minutes_ago', 
    'eitems_privat.last_seen_hours_ago', 
    'eitems_privat.last_seen_at', 'eitems_privat.online_now', 
    'eitems_privat.now_looking_for', 
    'eitems_privat.send_offer_link', 
    'eitems_privat.last_seen_unknown', 
    'eitems_privat.sold', 'eitems_privat.setting.global_system_message_severity.important', 
    'eitems_privat.setting.global_system_message_severity.warning', 
    'eitems_privat.setting.global_system_message_severity.info', 
    'eitems_privat.read_more', 'eitems_privat.load_more_messages', 
    'eitems_privat.last_seen_just_now', 
    'eitems_privat.last_seen_minutes_ago', 
    'eitems_privat.last_seen_hours_ago', 
    'eitems_privat.last_seen_at', 'eitems_privat.online_now', 
    'eitems_privat.now_looking_for', 
    'eitems_privat.send_offer_link', 
    'eitems_privat.last_seen_unknown', 
    'eitems_privat.sold', 'eitems_privat.setting.global_system_message_severity.important', 
    'eitems_privat.setting.global_system_message_severity.warning', 
    'eitems_privat.setting.global_system_message_severity.info', 
    'eitems_privat.read_more', 'eitems_privat.load_more_messages'
  )

Query time 0.00283

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 14,
      "filtered": 100,
      "index_condition": "lang.lang_code = 'en' and lang.`name` in ('eitems_privat.last_seen_just_now','eitems_privat.last_seen_minutes_ago','eitems_privat.last_seen_hours_ago','eitems_privat.last_seen_at','eitems_privat.online_now','eitems_privat.now_looking_for','eitems_privat.send_offer_link','eitems_privat.last_seen_unknown','eitems_privat.sold','eitems_privat.setting.global_system_message_severity.important','eitems_privat.setting.global_system_message_severity.warning','eitems_privat.setting.global_system_message_severity.info','eitems_privat.read_more','eitems_privat.load_more_messages','eitems_privat.last_seen_just_now','eitems_privat.last_seen_minutes_ago','eitems_privat.last_seen_hours_ago','eitems_privat.last_seen_at','eitems_privat.online_now','eitems_privat.now_looking_for','eitems_privat.send_offer_link','eitems_privat.last_seen_unknown','eitems_privat.sold','eitems_privat.setting.global_system_message_severity.important','eitems_privat.setting.global_system_message_severity.warning','eitems_privat.setting.global_system_message_severity.info','eitems_privat.read_more','eitems_privat.load_more_messages')"
    }
  }
}