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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a12708dd2167c688d9c8afa3c12ecf04f1e4c61d751f267632c7e3b7a700e4' 
  AND token = 'mAlhUHlJTp+ihw409k8ljVAI7JfyuBxNyFz3/yNXyJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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