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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03de7fe6f7116e8f5876e07c5fd03d5d6caeecd53b4452401130350b675e8ed8' 
  AND token = 'rFn229sUR2V02wd7mwOZJDWAlSoUh3tEzObpXDlLFI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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