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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f85d01d2fac8fa91d78111a039528b47e0eaae8f12284b8b01886e5a57ee199' 
  AND token = 'MF9xYgdEee5ycx3XuEkexeW+yWuryySrv2DuAQ0eFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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