Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ae61cf572ae00912a179b497bd1ea3f614b8e2e1a63f433ef54a3712fdc209' 
  AND token = 'p7/Vn6Qd6lXJfFWvMTN/cORDvrkf5Dor72Mfl45t6RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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