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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd612b51eadc88a6128979ecd80e5dc90439468b89cabd84d6407ad918de4b197' 
  AND token = 'ONm/kUZlrx1IsYXtmmn+LFc1eOGOvq44Zx0ffHIh5zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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