Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c659908dc31a54b3ab90cbfc45631114083eabfc799f461bcc4b20da9ec71e' 
  AND token = 'jCKEv6OcZegMUfeq9IfargmYGLozqFDrvqhZoonMxsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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