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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9920b080bc02be3e90e3de92a8002636a9682439a24974d1e6649847ef57a44f' 
  AND token = '9JPILwxMZwlAYNH4A0cvu4Ofv/7xycdqJDU/JxZf95g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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