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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e372a147cc49765b53397874eb042c2d1a0845550ab860bea2182f689df81357' 
  AND token = 'XYmSn40IWpvZ9nCLAm5IHB9CfXfZEW7Cy6RiQDpnwt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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