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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1712c7bf09364aab3940b9626c231ae4915e13b4f2fdf3d1517d1f17751bb8cb' 
  AND token = 'cX7jf+CvjxkmgzQ3iTYvp3Ts4Ux1QH5AYpun9nHTHTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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