SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694453a6bd84602c71f5780f581a7f64c22c819f300ba17621a056c74f64f43b' 
  AND token = 'BlZUcjJyCp+MZ1MiZ5twKXgKQbyyLFrCdiH//NQAOj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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