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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641b82e3046723f2c17308216fd6e5f9a52a8e622807bef0e5dfb058f6ab2ae1' 
  AND token = 'rGTnRHNgmSo4RDOREeXD1ZtZU8AY0pycHzyeyLM0mF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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