SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b2a215b7c51f2969da59caf46787cc94685a8e5de411b3e266ac3101f6036a' 
  AND token = 'F4et/zRniHdv0uYk41JeFXujH5PZBGGcMvWw+CL+si0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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