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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3415235dbb8782c885f12794f9bea4ea84a07d7779d5c84fb44395574ee2ce28' 
  AND token = '7aiZsFmjclC5+TxHc8gVaD08z65TgXh9MmaJvhRmg4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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