SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927a50ae4f80969f83ab781f26a97c647d2b55ed93aa29517212b41760048ce7' 
  AND token = 'IjWrHPiYGWPp8w/sv+m4FbEKNmr2ZkYLOvjomQqmarM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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