Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546bda03ec96d84aa4ce57192df72ece50442882f2eb4e88ff3a44a233af76c7' 
  AND token = 'dqfcV1IbVqDN5ZbPgQRjnx6o2QOyWPxRG7FEW0O9Gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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