SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fb142dcfc51cd2ae231ae56d2d7b142084023b3711a7f597bae03da93d2b95' 
  AND token = 'l8R/aePPToAwsR2mpvzoLRz0Sw3V7CqY/+PQKI0p/hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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