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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7749984b536219afcff20955169de0c09e1a325ee26ccc03146d7117f13a770c' 
  AND token = 'KZZ06p0ba7E7DDAZm8OwNlVl+PX9LlQoru0QhpHwwcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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