SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1db8559b6f8eb6a8fcd4a97b70fb425eda499b6d73656286810635b42202ff' 
  AND token = 'krGIDP1qZHDhf0hYQukmHmK+z+Nb2GI/sYod3jIAHmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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