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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f10bafa24546427e7cd0499a5972f2aab85a61dead42f791fb2811b5ac17f6' 
  AND token = 'lOavGkftAvio3RRyM2klvgQij64P5Vlp4TsnvOG4LjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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