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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be5f696030802d673f1a1d2540996cd87cdf1304b5ec40e1630e46e8669f633' 
  AND token = 'TOZw6LGdc6OVAAzqm8aYNNNotFpWh/LAKH7pt6lQJ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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