Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878be2ff984a3776b734c8591b13a49591ba7401ceff44cbb28c82534afc5a12' 
  AND token = 'aWMrt+I4+Fj7wxuFDOF5wX6ISEAU2J5ZX3u/w279hB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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