SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091a4038497760da4879eb74cda9935bf672391d939f5a0617aa23b904f1774c' 
  AND token = 'ngb3PWFdGD2+vF4UNrvASUj+ElIzwL+xYRGK4UJUVHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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