Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b9d1b8d235203b5d6d49ab234643674a74d79c959e69644d60249efa1c46ad' 
  AND token = 'RdV3RozPETlj7BGJP2LLKc1jrRPut8qMnRua5sVLOd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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