SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06961baa68f4df6ba24c614e03abbcc8cd98c4322906f9bbbf2c8134b145f0a9' 
  AND token = 'ZANmvgzcPdGjRUXray3JirUMKlU2KBw6LyAjC+mHzOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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