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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd1774293b5fd05d8868300d0580496acb89b99675ad551723b7b0bd73b17b3' 
  AND token = 'uL7qOoJ+DaaeIq31FGeVZlzCtr/q8u2roxFGrnqdVhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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