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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eaa6a6a4bdbf5863e56b693d61253950f36fc88b9777936194da102d9d663c' 
  AND token = 'yLIUlrwHqlL4FVSVPRB6XxbJl9qF2gMEmukc+0HX7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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