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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ddde738b49af55c57b445b0ed037720a6be53751ac2a41bb36b610ae7afaf7' 
  AND token = 'mXXr7EVpPnNihBng8GX6ePQ3hKBGHUF3bogCf6c7Pno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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