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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3173b53b494aefea935dfc7335e49364c3c11015175d44ad55f332d9fa359e3' 
  AND token = '3GMqO4nrNNprK3iw6Oyq7hysznU7DHXS9yROFvq5I4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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