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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ef84b5f7de6bc9946eaa517304a0cf6ecfebe6d826f24f01bcf74eb9f811c0' 
  AND token = 'bqWOu5FcKMJIzMvMF+7Gygv1NioSDXaMZkVbcRT0XQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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