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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19240eeabbacf1fbb6b164927542b9589db622f4013c921f70ab1d7183d198dd' 
  AND token = '8A5vO9oJV9FnwMjWVOdXiztW22QTwFj31hrald685Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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