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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247262995f01fcb5d24965305060dd3e7dc02ae692c75a4f9e68959d91eaf92f' 
  AND token = '4FtmJ6P5VyY96xBVSo0C4MWb3Kb5Twr83cId6r9KFQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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