Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81016655a2e43ef991f9111347cbb494ce1c65aeb5e99d375aabd51211d0eea7' 
  AND token = 'rUd6bSIvfrx/NLlqouvR6yr/gxhn529+Mf+ywtqt+8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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