UPDATE 
  cscart_order_data 
SET 
  data = 'a:1:{i:6;a:9:{s:9:"rate_type";s:1:"P";s:10:"rate_value";s:6:"10.000";s:18:"price_includes_tax";s:1:"Y";s:9:"regnumber";s:7:"1234242";s:8:"priority";i:0;s:12:"tax_subtotal";d:10;s:11:"description";s:3:"VAT";s:16:"calculation_type";s:8:"subtotal";s:7:"applies";a:3:{s:1:"P";i:10;s:1:"S";d:2.55;s:5:"items";a:2:{s:1:"S";a:1:{i:0;a:1:{i:1;b:1;}}s:1:"P";a:1:{i:4194326291;b:1;}}}}}' 
WHERE 
  order_id = 453 
  AND type = 'T'