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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c486e7e69c498258fe3c903d418e168dc9b9e7b3e17de66ba01b988c88da73' 
  AND token = 'UMQknWSNlH1F4H/fmwySocUdzsT1P7lWuAlP4xGBkXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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