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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c337f20fc8590083751bdf94bd4b9d6d86ef2f8721aea8af208a5cfe5b7057' 
  AND token = '57nHJ3hQ/OfG04+XJkxk3xazyJbF5unWtXyXlOwId2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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