SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f0a1cf7232a735fd685b9cb58caa568d4275841433100113c094860c6ce2cb' 
  AND token = 'pqvmIt0JjMOavPSO3ZqnxmQu2gem/yTzQ6XdnvLIwa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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