SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e85cda19d550ed5c30b785d7849680cfa6fabbb4232ade0bbd173afb504147' 
  AND token = 'SCBpBSBeKU0Lr9TpPWV9svU2DwYsWrl+hY8Cn6jehmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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