SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c3bcc22c5dce3d9e7fd18f8413fc177c992898a1ee88bbb57ba2df1c6d6529' 
  AND token = 'tJPlBrGkgYiAC5tGz9S+yuvknZLBvzBySynuKcPpMls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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