SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113d03d98cde4a7c0b8bce0979260c3bbe50be8162837f3ab1875ef7f5bcb397' 
  AND token = 'zTu4jlzJYk2rMCug3gMh+aT50RePsmpZLruO4/tqVf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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