This can be done by using dj.key_hash to convert the key as follows:

In [4]: jk = {'table_name': JobResults.table_name, 'key_hash' : dj.key_hash({'id': 2})}
In [5]: schema.jobs & jk
Out[5]:
*table_name    *key_hash      status     key        error_message  error_stac user           host      pid        connection_id  timestamp
+------------+ +------------+ +--------+ +--------+ +------------+ +--------+ +------------+ +-------+ +--------+ +------------+ +------------+
__job_results  c81e728d9d4c2f error      =BLOB=     KeyboardInterr =BLOB=     datajoint@localhost  localhost     15571     59             2017-09-04 14:
 (Total: 1)

In [6]: (schema.jobs & jk).delete()

In [7]: schema.jobs & jk
Out[7]:
*table_name    *key_hash    status     key        error_message  error_stac user     host     pid     connection_id  timestamp
+------------+ +----------+ +--------+ +--------+ +------------+ +--------+ +------+ +------+ +-----+ +------------+ +-----------+

 (Total: 0)

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