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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e03247deec89d543cd872eb2f6c9bc5af0a83cdd478c8f8595a334ddaa4ac5' 
  AND token = 'oibXGoCwbk9kSkCngI6jWdE9Dih0m+hm9w/QR3hnz1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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