Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81627d47a57dabe3aaf9facf21c6039e6fd8d5e33476cc0275d7a7f7c42b7f8' 
  AND token = 'zy4NwtFMhxh0Iq4gH/CU2pRUJ4LNs6gMQoSQC9EJe/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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