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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b257843bf8c54e54043d001076df6283e768a4523b26b4cd891569a8480f11' 
  AND token = '9DCX3rChmHX3f1bzckgokpP4GSRYyeKfCRKqgJG79bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}