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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33df20e4a868dee767798de6ac09ee0b86d5fb73657a269c759e5ac8aac79f1' 
  AND token = 'aXO+qzL6luoaBeY5wWk8lxUUcsNzXJbnmhItjxkwl+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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