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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d759c0cc064b01bf3b6a844e772169c665800f3f39659c3093cc7ee2510dbe' 
  AND token = 'JsXtaNNyqlJHBlELHnRosueSOpqGR6W8ErR+roiDHSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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