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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1d1e5146f0f05f103089933c6c7a97cf20628d95529891aa01073a599598dc' 
  AND token = 'MYSiKq/P0NMy4ovANrtbT69WH32LUrWo9PjOYr0Lsr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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