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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bef7f454a96e56aa6048682476b5f94c4425c7706d543c9758355bc69e8635d' 
  AND token = '6u7DCTAx1fxmWbq7lFnL+lXrYUzlchcwTAHchbBDHKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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