SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397ec127a22fb4d9595d2dfdf85075a66bd69409ddbb2e35b331bb4f3111fad8' 
  AND token = 'iFxnViW5B/yQboKXZhlIbOowqUz6mqnjVVpHkwjdBRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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