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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4da1beb013693918a62526f2d9ab04c155cb04dcceb8c8385bbedbf57944bac' 
  AND token = 'sui+XqDoB7T5KrwTUfE6g0a+J9qcNZt2SmrsSgUjSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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