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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b0bbd0222129bcea1338a0884423c31c718e20298f958a329a892e50650666' 
  AND token = '0VEQhtGBbb7mBA//w4aEJCmb7FytOdON8RPr0UME+Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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