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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28267ed3b67aa85210a66181cb888f92bfc63d53673d59f61ec5530e86ac05bf' 
  AND token = 'GLvP9roOUKcEdArdQ5J3/RAj31LaG3Sy2dRU6H+SL0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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