SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bede3f9d897fa5c52ea58392f2461a7d6a30323673b25d4add58b169153933a0' 
  AND token = 'Vnwjj8DmibQuCp1UfGr/4fgCggqZI1lIgG2oYw4vg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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