Just had a search in Ancestry's Essex Parish Register Index 1792 to 1833, an Essex wide search, no John Hoy found at Magdalen Laver, Hatfield, Matching or Netteswell.
The only John Hoy in that period with parents John & Mary was baptised 25 ? 1797 at Elmdon, Essex, the month was not given the date shown as 25/1792, that date unfortunately doesn't fit your requirements.
I also checked for a John Houchin with parents John and Mary and again there was only one in that period, he was baptised 5 Aug 1800 at Terling.
There were also quite a few children named John How and Hey, even those did not fit.
There were the following two, close to the period you are looking at but not with parents John and Mary.
John son of James and Elizabeth Hoy baptised 2 Jun 1816 at Steeple Bumpstead.
John son of Joseph and Mary Hoy baptised 29 Mar 1818 at Great Waltham.
Unfortunately not the parents you want nor in the right area.