SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4563b2f220477987eda3e5d2939111baa686d23d5c5da57f00d3facf1a8ee487' 
  AND token = 'KMizUhH0fjwPu35rHmNz/gnSFuSNGJJhUcN1IbxGSww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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