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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2a70fed80c2185dc8211642cf1f4931e9bb646792f9a4cc4b1e0dac924c7ab' 
  AND token = '76GTxrM0fB2FFxMjTrsOs72TF+xSgqDElzRrtoym1Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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