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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b23fd9ce38ea999ff07aa8e6d9a095f341a3dd268d981acc771a09615054fa' 
  AND token = 's+BpE5Gej0pBZmo1bP4DOJXrkRKS5T5tCZSZoc/EwN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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