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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f63e66c8be2506bb526660c900928fa380de7635eb4f6935458ef37ee4cd4ec' 
  AND token = '7VvTxYyzbIEzyTx5dqc/3iZtc4RTylMjLeuHcQQpXyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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