The history of the key is unknown, however at some point in time, it became the property of Mark Cho. Cho would then hold the key for an undisclosed amount of time in a safe behind a framed photograph in his house.
When Mark learns of Rendell Locke's death, he gathers all documents pertaining to Keyhouse Manor, and stabs himself with the key. This causes him to combust into flames, burning his entire house — and the documents — to the ground.
Following Sam's death at the hands of the Ghost Key, the key falls into the possession of Bode Locke, who attaches the key to one end of a light sabre and uses it to attack Dodge's shadow; this causes the shadow to explode.
The key can be used to create fires when inserted into a door or touched to an object. Furthermore, one may cause self-immolation/combustion by plunging the key into one's body.
- The Matchstick Key does not appear in the graphic novels; it was created specifically for the Netflix adaptation.
- The Matchstick Key appears to possess powers that are similar but not exact to the Splody Key, a key that only appears as part of Bode's Guide to the Known Keys journal. The difference being that the Matchstick Key causes fires, while the Splody Key causes explosions.