SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2b55645baf4880be143ab6ad3b1eb7793c1183ccd8d8591f9d92b3c27d417b' 
  AND token = 'prNyGuEyIWV3XjQEfkrCqL+xpUpDEjw1ChlEiwDQgK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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