SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913783ba0f63a94fae0ffb7368ed960396423d0321d4c5e29a51eb0b2f9c197c' 
  AND token = 'lsjAq0CpBYvckc79krGdhWHfzgpmi/5mNMDHJ3vSXKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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