SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22573336f32dc5168e4952a128a4a3872db90b91f47ad2f1fee4132f6abce1c6' 
  AND token = 'yGz47VPHr9WthjrihOlssiw/oPkGVxJcBJ7ZxAK3Wgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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