SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4646f513a9f89f0527dbe974a53c32a16361e9b55b35421392a622fa50668100' 
  AND token = 'wYZMZgntKSWT3h+2EBhM1rQr/vYPxJ++AruNqf2ZRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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