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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30155168118b624086c1f4ace0f126c86aea204d83d4f057c62fa43ecc9d79d' 
  AND token = '4hrhFZPaMToL3L/FmDhbFrRrcgxEhIciYugZta7fFWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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