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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3717f7fee3ec88222dbb057cecdb00dff8dd6be1779caa6e9629dcb9bb1f2b53' 
  AND token = '99HXDlfQbZ3V7saOwqjpei3B0r+57CQ8xNhjKGUK8gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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