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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4c054ca79282172f469f1ed099ca6d6c26075e426d4070fc2f45238d700383' 
  AND token = 'cOXfdyT9XJgogSdqzsE/E9hCl2Bmr3NIKOW8+lI/LGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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