SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b24ec4812fe28564da1ed98b9a46e861de11e2ec6056ae2461bbb24f1baa58' 
  AND token = 'uInzFay1QAX15YzVmK5hGCxOUjR1mj/gMGXpVC1mrnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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