Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6e32dfc79d7f2fa5f33917e1d1e6c7a24ebc54147c63eb9e656fed2f68e34a' 
  AND token = 'yJZmMYnBQQATNHhakJv5vT9dPp0fv9usO31UwJbI1mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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