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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e3aad26600f5e123c94a8db35da93fc718aa25e8cf1fd9ec8095c05ed7b6cb' 
  AND token = '8ytq5wh085v8x6ipeqXRZzGxYtkIgEkDohlB+U6waB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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