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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ad9e1b2f569f39cd86aa430c1d113d33580eccdb9532833b777454701fb3cb' 
  AND token = 'x2u8Vz7A8LEE8/yL/4KsmOYHK4tZoc6IZUISwH3MROg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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