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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5833e349121d59efa60cf1f72a552d484198650a1ec410fd38db70f3de0a10cb' 
  AND token = 'KJ61irlusng0MOTnQ2kIO8YCaVPkLPOefuCUeqTMD54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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