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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fca57b8a4a10dd7f13ef0cfd27c87f83692ebf029623e2d2fc1a96ce0e6718e' 
  AND token = 'CPStuTbz7klA1oZYCYcdKQimo40bQ0ktLVcfDdYF41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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