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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff0ddd83c6127809853a8bd24d7eab4655937959896035f58ce40ed69c05b46' 
  AND token = 'vzsud4aVOJ7du87A4+H20amy5SwmvJ8ur+88yg9K3i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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