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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986cba9de5660d9a705b62cbadd63b638bdc1f6a9aa7f791152b1a6364c9c9a9' 
  AND token = 'kGz/t7uS7ZCdEDf8zE0BMPPA8dLMZ+8Bm3e2x/oJssw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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