Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffd3b4937c046bf3d8fc938af58f556ed728b8bf58fbf921ea01313847c9a45' 
  AND token = 'Wi++H6ykX7SpKw7HNzNhPRN5Sdac2WIe+vSN4v2FrM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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