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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7670dce437403a655e604b075c4a6cc35489e66c6d205e11ab8715c7aca1477' 
  AND token = 'Xs4b2IT4ipXTAg377kdKEpcF0CgG4r3jmXkEcKk1bDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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