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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beabb34b5c63c20311d32fc0cbe9b018554e1706973503a3a4e0a40b1d6fc8ec' 
  AND token = '1WfVrrmJNGZsLQ56sSybJ8FpLt3wwCs3Qxpgq5XRsII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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